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<title>focus([[data],fn])</title>
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    <h2><span>返回值:jQuery</span>focus([[data],fn])</h2>
    <h3>概述</h3>
    <div class="desc">
      <p>触发每一个匹配元素的focus事件。</p>
      <div class="longdesc">
        <p>可以通过鼠标点击或者键盘上的TAB导航触发。这将触发所有绑定的focus函数，注意，某些对象不支持focus方法。</p>
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    <h3>参数</h3>
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      <h4><strong>fn</strong><span>Function</span><em>V1.0</em></h4>
      <p>在每一个匹配元素的focus事件中绑定的处理函数。</p>
      <h4><strong>[data],fn</strong><span>String,Function</span><em>V1.4.3</em></h4>
      <p><strong>data</strong>:focus([Data], fn) 可传入data供函数fn处理。</p>
      <p><strong>fn</strong>:在每一个匹配元素的focus事件中绑定的处理函数。</p>
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    <div class="example">
      <h3>示例</h3>
      <span id="f_ad2"></span>
      <h4>描述:</h4>
      <p>当页面加载后将 id 为 'login' 的元素设置焦点:</p>
      <h5>jQuery 代码:</h5>
      <pre><code>$(document).ready(function(){
  $("#login").focus();
});</code></pre>
      <h4>描述:</h4>
      <p>使人无法使用文本框:</p>
      <h5>jQuery 代码:</h5>
      <pre><code>$("input[type=text]").focus(function(){
  this.blur();
});</code></pre>
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